Gordon - the person you need to contact is: Jimmy D. Brown.
He teaches people to setup autoresponder memberships.
Here is his salespage I had come across some time back:
http://www.membernaire.com/
Because he teaches so many people to do what you're looking for, he'll be knowing most of the tricks. And should be able to refer you to his best students.
I've bought products from Jimmy before and they're very good. I haven't bought his membernaire product though.